On Monday, United disclosed a buyout offer from B. Riley (no price was given), and said it plans to review it. The company, which owns Classmates.com, the MyPoints online rewards program, low-cost ISPs NetZero and Juno, and other Internet assets, currently trades at $11.49.

Universal Display is rallying to new 52-week highs yet again amid Galaxy S6 enthusiasm. Solar3D is now up 42% over the last 3 trading days. Heavily-shorted Cheetah Mobile is reversing Friday's post-earnings losses. Castlight is adding to the losses seen on Friday following a neutral Wells Fargo launch.

United Online (UNTD+16.7%) had Q2 adjusted OIBDA of $10.2M, roughly flat Y/Y and above guidance of $6.5M-$8.5M. The company has hiked its full-year adjusted OIBDA guidance to $31M-$35M from $29M-$34M.

Mobile broadband and ad growth fueled a 5% Y/Y increase in communications revenue to $26.2M, which in turn helped total revenue beat estimates. Internet subs fell by 15K Q/Q to 328K, and all other paid accounts by 5K to 197K. ARPU rose $0.30 to $10.72.